For larger enterprises with complex org charts, I consider an agenda one of two invaluable tools for meetings, the other being post-meeting minutes including a RACI chart.

If someone can't think up a few bullet points for a meeting in advance, that person has not prepared for their meeting, and will waste some of the participant's time.

Not creating (one-line) minutes that most importantly include decisions that have been made in the meeting is also the perfect set-up for wasting other people's time.

I see this similar to the effort of writing a good commit message.